Contact electric impedance and resistance studies of the conduction mechanism in passive films on ferrous alloys

Iva Betova, Martin Bojinov (Corresponding Author), Anders Englund, Gunilla Fabricius, Timo Laitinen, Kari Mäkelä, Timo Saario, Göran Sundholm

    Research output: Contribution to journalArticleScientificpeer-review

    26 Citations (Scopus)

    Abstract

    A quantitative approach to evaluate the effect of the passive film on the corrosion resistance of ferrous alloys is introduced. It is based on recent developments of the theoretical description of ionic and electronic transport through passive films and newly introduced electrochemical techniques. The procedure is tested on an extensive set of experimental data for the passive state of Fe–Cr–Mo alloys in neutral solutions obtained using a combination of electrochemical techniques. The fair agreement between theory and experiment can be taken as proof of the validity of the present approach and the assumptions involved. The model predictions are in agreement with the accelerating effect of Mo on the rate of transpassive dissolution of Cr from Fe–Cr–Mo alloys. The comparison of model calculations and experimental data also shows that the presence of Mo in the film slows down the rate of iron dissolution via the divalent interstitial route in the passive range. These impacts of Mo can be explained by its presence in both octahedral and tetrahedral positions in the oxide lattice. This kind of separate estimation of the impact of different alloying additives can thus lead to reliable predictions of the corrosion behaviour of alloys in a range of conditions.
    Original languageEnglish
    Pages (from-to)3627-3640
    Number of pages14
    JournalElectrochimica Acta
    Volume46
    Issue number24-25
    DOIs
    Publication statusPublished - 2001
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Electric contacts
    Iron alloys
    Dissolution
    Alloying
    Oxides
    Corrosion resistance
    Iron
    Corrosion
    Experiments

    Keywords

    • Iron-chromium-molybdenum alloys
    • Impendance spectroscopy
    • Contact electric resistance (CER) technique
    • Mixed-conduction model
    • Point defect transport

    Cite this

    Betova, I., Bojinov, M., Englund, A., Fabricius, G., Laitinen, T., Mäkelä, K., ... Sundholm, G. (2001). Contact electric impedance and resistance studies of the conduction mechanism in passive films on ferrous alloys. Electrochimica Acta, 46(24-25), 3627-3640. https://doi.org/10.1016/S0013-4686(01)00641-7
    Betova, Iva ; Bojinov, Martin ; Englund, Anders ; Fabricius, Gunilla ; Laitinen, Timo ; Mäkelä, Kari ; Saario, Timo ; Sundholm, Göran. / Contact electric impedance and resistance studies of the conduction mechanism in passive films on ferrous alloys. In: Electrochimica Acta. 2001 ; Vol. 46, No. 24-25. pp. 3627-3640.
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    abstract = "A quantitative approach to evaluate the effect of the passive film on the corrosion resistance of ferrous alloys is introduced. It is based on recent developments of the theoretical description of ionic and electronic transport through passive films and newly introduced electrochemical techniques. The procedure is tested on an extensive set of experimental data for the passive state of Fe–Cr–Mo alloys in neutral solutions obtained using a combination of electrochemical techniques. The fair agreement between theory and experiment can be taken as proof of the validity of the present approach and the assumptions involved. The model predictions are in agreement with the accelerating effect of Mo on the rate of transpassive dissolution of Cr from Fe–Cr–Mo alloys. The comparison of model calculations and experimental data also shows that the presence of Mo in the film slows down the rate of iron dissolution via the divalent interstitial route in the passive range. These impacts of Mo can be explained by its presence in both octahedral and tetrahedral positions in the oxide lattice. This kind of separate estimation of the impact of different alloying additives can thus lead to reliable predictions of the corrosion behaviour of alloys in a range of conditions.",
    keywords = "Iron-chromium-molybdenum alloys, Impendance spectroscopy, Contact electric resistance (CER) technique, Mixed-conduction model, Point defect transport",
    author = "Iva Betova and Martin Bojinov and Anders Englund and Gunilla Fabricius and Timo Laitinen and Kari M{\"a}kel{\"a} and Timo Saario and G{\"o}ran Sundholm",
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    Betova, I, Bojinov, M, Englund, A, Fabricius, G, Laitinen, T, Mäkelä, K, Saario, T & Sundholm, G 2001, 'Contact electric impedance and resistance studies of the conduction mechanism in passive films on ferrous alloys', Electrochimica Acta, vol. 46, no. 24-25, pp. 3627-3640. https://doi.org/10.1016/S0013-4686(01)00641-7

    Contact electric impedance and resistance studies of the conduction mechanism in passive films on ferrous alloys. / Betova, Iva; Bojinov, Martin (Corresponding Author); Englund, Anders; Fabricius, Gunilla; Laitinen, Timo; Mäkelä, Kari; Saario, Timo; Sundholm, Göran.

    In: Electrochimica Acta, Vol. 46, No. 24-25, 2001, p. 3627-3640.

    Research output: Contribution to journalArticleScientificpeer-review

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    T1 - Contact electric impedance and resistance studies of the conduction mechanism in passive films on ferrous alloys

    AU - Betova, Iva

    AU - Bojinov, Martin

    AU - Englund, Anders

    AU - Fabricius, Gunilla

    AU - Laitinen, Timo

    AU - Mäkelä, Kari

    AU - Saario, Timo

    AU - Sundholm, Göran

    PY - 2001

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    N2 - A quantitative approach to evaluate the effect of the passive film on the corrosion resistance of ferrous alloys is introduced. It is based on recent developments of the theoretical description of ionic and electronic transport through passive films and newly introduced electrochemical techniques. The procedure is tested on an extensive set of experimental data for the passive state of Fe–Cr–Mo alloys in neutral solutions obtained using a combination of electrochemical techniques. The fair agreement between theory and experiment can be taken as proof of the validity of the present approach and the assumptions involved. The model predictions are in agreement with the accelerating effect of Mo on the rate of transpassive dissolution of Cr from Fe–Cr–Mo alloys. The comparison of model calculations and experimental data also shows that the presence of Mo in the film slows down the rate of iron dissolution via the divalent interstitial route in the passive range. These impacts of Mo can be explained by its presence in both octahedral and tetrahedral positions in the oxide lattice. This kind of separate estimation of the impact of different alloying additives can thus lead to reliable predictions of the corrosion behaviour of alloys in a range of conditions.

    AB - A quantitative approach to evaluate the effect of the passive film on the corrosion resistance of ferrous alloys is introduced. It is based on recent developments of the theoretical description of ionic and electronic transport through passive films and newly introduced electrochemical techniques. The procedure is tested on an extensive set of experimental data for the passive state of Fe–Cr–Mo alloys in neutral solutions obtained using a combination of electrochemical techniques. The fair agreement between theory and experiment can be taken as proof of the validity of the present approach and the assumptions involved. The model predictions are in agreement with the accelerating effect of Mo on the rate of transpassive dissolution of Cr from Fe–Cr–Mo alloys. The comparison of model calculations and experimental data also shows that the presence of Mo in the film slows down the rate of iron dissolution via the divalent interstitial route in the passive range. These impacts of Mo can be explained by its presence in both octahedral and tetrahedral positions in the oxide lattice. This kind of separate estimation of the impact of different alloying additives can thus lead to reliable predictions of the corrosion behaviour of alloys in a range of conditions.

    KW - Iron-chromium-molybdenum alloys

    KW - Impendance spectroscopy

    KW - Contact electric resistance (CER) technique

    KW - Mixed-conduction model

    KW - Point defect transport

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    M3 - Article

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    JO - Electrochimica Acta

    JF - Electrochimica Acta

    SN - 0013-4686

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    ER -